He might well have had a malfunction that he didn't properly deal with. But there is no part called a "slide lock spring" in a 1911. Do you know what the problem was?
Never claimed to be a 1911 armorer. There was a problem with the gun that caused the slide stop to hang up, every time. He just figured he could manipulate it. It was not a random malfunction. This happened 40 years ago, some details get fuzzy.